9/12/2015
Updated the Thanks &
Acknowledgements page to include thanks to Mr. Charles Smith for donation
of technical and service documentation for
Monroe 920 and 925
electronic calculators, as well as a fully functional Monroe 920
calculator to the museum.
Updates to the
Monroe 920 exhibit.

12/12/2014
Added a new feature to the
Articles & Other Information section called
the Calculator News Archive. This
is a collection of vintage article clippings from newspapers, trade
publications, and vendor press releases relating to electronic calculator
development.

8/23/2012
Updated the Bohn Omnitrex 8
exhibit to add a photo of the Bohn Omnitrex 12, a twelve digit machine
that is visually almost identical to the Omnitrex 8, but with four
additional digits of capacity, added constant mode, and full support for
numbers with decimal points. Thanks to Jared Tichy for the photo of
this machine.

8/23/2012
Updated the Bohn Omnitrex-8
exhibit to include information a similar machine with twelve digits
of capacity.

2/15/2012
The Old Calculator Museum "Guestbook" feature is temporarily offline. The service provider that the museum was using to provide the Guestbook services has decided to shut down their services. I am looking for another Guestbook solution which I will put in place as soon as possible. If you need to contact the museum, please visit and read the EMail page. Sorry for the inconvenience.

6/21/2011
Updated the Texas Instruments SR-60 exhibit to correct an error stating that the LSI ICs in the
machine were CMOS-technology devices. In reality, the devices were
made wtih PMOS technology.
Sincere thanks to Eric Smith for pointing out this error.

5/16/2011
Updated the
Victor 3900 - History's Forgotten Miracle article to correct a few
typographical errors, along with adding a few additional images.
Sincere thanks to George Lemaster for providing these images.

1/20/2011
Added Advertisement for the
Sharp Compet 30 CS-30B (updated version of the original Compet 30 Model CS-30A)
to the Advertising & Documentation Archive section.Sincere thanks to Takaharu Yoshida for making providing the scan of this ad.

11/23/2010
Updated the Facit 1121 exhibit to
include more information on the development of the relationship between
Hayakawa Electric and Facit.
Sincere thanks to Mr. Takaharu Yoshida for providing some historical
information and scan of an old Japanese Facit 1121 ad.

11/23/2010
Added new exhibit: Facit 1121
Sincere thanks to Ms. Grace Ulbricht and Mr. Arthur Beach for donation
of Facit 1121 calculators to the museum.
Updates to the Sharp Compet 20 exhibit to include information on the [000] key.

Sincere thanks to Takaharu Yoshida for providing the scans of these original
advertisements.

6/26/2010
Updated the
Tektronix Model 31 exhibit
to include a photo of a one-off production concept utilizing a more computer-like
color scheme rather than the "Tek Blue" instrumentation-oriented color scheme.
Updated the Commodore 500E exhibit to include added photo of calculator's backplane.

1/30/2010
Updated the Friden 130 exhibit
to include information on differences in decimal point setting locations
between prototype machines used early on in the marketing process and
production machines, as well as Friden's "fix" for customers who complained
about it.

1/12/2010
Updated the Friden EC-132 exhibit to include information on a new donation received by the museum of a Friden EC-132, Serial #11945, received from Mr. Pat Scandalis. The museum
wishes to express its sincere thanks to Mr. Scandalis for his generous donation.

1/9/2010
Added Google Custom Search function to site. Search box appears at the top of each major page, and provides search capability across the entire Old Calculator Museum website.

9/19/2009
Updated the
Old Calculator Museum Blog.
Updated the Friden 130 exhibit
to include information on an optional entry counter option that was made
available for both the Friden 130 and 132 calculators in June of 1965.

9/19/2009
Updated the Links page to include
a link to Brian Cauchi's Friden 130 on a FPGA website. Brian has built a facsimilie
of a Friden 130 using current-day FPGA (Field Programmable Gate Array)
technology and an oscilloscope for the display. An amazing accomplishment,
very worthy of checking out.
Added Monroe 610 to the
Wanted page.

12/23/2008
A new feature is added to the Old Calculator Web Museum. The museum now has
its own blog.
A link to the blog has been placed in the
Articles & Other Information page
for visitors to use to access the blog. The blog is a place where the curator
can ramble on about various projects going on in the museum, interesting
discoveries or tidbits of information, or whatever else may be knocking around
inside his head at any given time. Please check out the blog to learn about
work to restore a Wang 370/371 Programmer.

12/10/2008
Added photo (thanks to Takaharu Yoshida) of the Sanyo ICC-141 calculator
to the Wanted page.
Update the Friden 132 exhibit to
include a link to an original Friden document explaining in detail the
method by which the 132 calculates square roots.
Added Friden 132 Square Root Mathematics document to the Articles & Other Information section of the museum.
The Friden 132 exhibit is now permanently dedicated to the memory of Clifford
Rueff, a senior service technician for Friden/Singer/TRW who worked out of
the Denver, Colorado office.

11/1/2008
Updated the ICM-816 exhibit to include information about Sony's ICC-88, which used the same
Electronic Arrays chipset as the ICM-816.

10/29/2003
Numerous updates to the SCM/Marchant
Cogito 240SR exhibit to improve readability, correct spelling and grammer
errors, and add other bits of information.

10/25/2008
Updated the preview exhibit for the
Mathatronics Mathatron 8-48MII
to include information on the limited production
run of Mathatron calculators that utilized hybrid resistor modules to
replace discrete resistors.

10/9/2008
Updated the Texas Instruments SR-60 exhibit to include more information, and a photo of a SR-60
magnetic card.Sincere thanks to Mike Cochran for donation of a very nice SR-60A calculator, along with a bunch of magnetic cards to the Old Calculator Museum.

7/3/2008
Updated the Wang 600 exhibit to include some tidbits about a solid-state Microcode ROM that may
have been offered in production (in place of the wire-rope/ferrite transistor
ROM), or as a factory replacement part.

7/23/2008
Updates to the Wanted page for
the Wyle WS-02
Updated the History of Compucorp
article to include a better photo of the Wyle Laboratories WS-02 calculator.Special thanks to Randy Liebermann for providing some old calculator advertising
literature that he has in his collection for scanning and presentation in the Old Calculator Web Museum.

3/9/2008
Updated the Wang 720C exhibit to
include new information regarding a "preview" of the HP 9100A given to Dr.
Wang by Bill Hewlett of Hewlett Packard. Thanks to Steve Leibson
of HP9825.COM for
allowing use of this tidbit of information gleaned from an interview that
he did in February of 2008 with Tom Osborne, chief designer of the HP 9100A.
For more wonderful insights on the development of the 9100A, and to be able
to view the video of the interview with Tom Osborne, please visit Steve's Story of the Development of the HP 9100A.
Updates to the Timeline of Calculator
History page in the Articles & Other
Information section.

12/20/2007
Update to the Commodore AL-1000 exhibit.Sincere thanks to Matthew Currie for donation of a very nice, early
serial-number AL-1000 in fully operating condition to the Old Calculator
Museum.
Updated the Thanks &
Acknowledgements page to acknowledge Mr. Currie's donation.

8/28/2007
Added front cover of Advanced Programming Reference Manual for Monroe 1800 Models to the
Advertising & Documentation Archive section.
Sincere thanks to John Engels for donation of this document to the Old Calculator Web Museum.
Added a new story to the "Recollections & Reflections"
section of the Articles & Other Information
page, about use of a Monroe 1880 calculator by Mr. John Engels at the Oregon
Bureau of Land Management to revolutionize the way that land management
calculations were performed. Mr Engels' story outlines the "discovery" of the power of the Monroe 1880
"Adding Machine" that was one day dropped on his desk, that eventually
resulted in a letter from then President Gerald Ford commending Mr.
Engels for his work in saving the BLM thousands of dollars by increasing
productivity.

8/25/2007
Updated the Wang LOCI-2
exhibit to include more accurate information about the Wang Laboratories
Linasec machine. Special thanks to George Finn for providing a great deal of
insight as to the true nature of the Linasec.

5/14/2007
Updated the Commodore C112
exhibit to include information about "early" and "late" versions of the
calculator. Sincere thanks to Mark Wyman for providing information and photos
of his later C112.

1/20/2007
Updated the
Cintra/Tektronix 909 exhibit with additional information. Special thanks to
Mr. Jack Gilmore for sharing some of his experiences as a Tektronix engineer involved in the reimplementation of the Cintra/Tektronix 909 into the Tektronix
Model 21 and 31 calculators.

11/24/2006
Updated the
Wang 700-Series Architecture Document to include information about a
mysterious microcode function (MOP14), which is listed in known Wang
documentation as an illegal or spare function, but has found to be used within
700-Series calculator microcode. Further evidence indicates that this particular
MOP code (1110) is also referenced in schematics, but the logic behind its
function is quite convoluted, and has yet to be deciphered. If anyone out
there knows the function of MOP14, please get in touch.
For now, this function remains a mystery, and the document has been updated
to reflect this mystery.

11/21/2006
Updated the
Wanted page to include the MITS 816 calculator. Thanks to Steve Shepard for
supplying a nice photo of his original MITS 816.

5/27/2006
Updated the
Wanted page to include additional
information relating to two different versions of the Sperry Remington EDC-III,
the EDC-III and EDC-IIIA. Also removed the Canon 167P from the Wanted list.

1/10/2006
Updated the Sharp Compet 20 and
Sharp Compet 16 exhibits
to include additional information on introduction dates of numerous Sharp
calculators as kindly provided by Mr. Iwase and Mr. Kimiya of Sharp
Corporation in Japan.

1/7/2006
Updated the Wang 144T Scientific exhibit to clear up the mystery of the "LRN" button. Thanks go out
to Mr. Andrew Klesh, a former Wang employee, for writing to the museum
with the solution to this mystery.

1/2/2006
Added new exhibit: Canon 130S. Sincere thanks to Katie Wasserman for donation of this wonderful artifact to the Old Calculator Web Museum.
Updated the Thanks &
Acknowledgements page to include credit to a number of recent contributors
to the museum.

12/27/2005
Updated the Timeline of Calculator
History page in the Articles & Other
Information section to include information about Sharp Corporation being
honored by receiving an IEEE Milestone Award. This award was established by
the IEEE in 1983, and is awarded in recognition of outstanding
historical achievement in areas of electrical and electronic engineering.
See Sharp's Press Release for more information on this great honor bestowed to
Sharp Corporation.

8/5/2005
Update to the Timeline of Calculator
History page in the Articles & Other
Information section to announce the death of Hiro Moyriyasu on
July 31. Mr. Moriyasu was a prolific engineer and skilled leader at Tektronix
for many years. He invented the concept of a digital storage oscilloscope; was
involved in the formation of the Tektronix calculator division with the acquisition of Cintra; a key player in the development of the groundbreaking
Tektronix 4051 desktop computer, which set IBM on its heels; and after his
tenure at Tektronix, forming two companies involved in high-tech development.
Mr. Moriyasu was 70 years old.

7/30/2005
Update to the Timeline of Calculator
History page in the Articles & Other
Information section, announcing the passing of Dr. Irwin Wunderman, founder
of Cintra, on July 27. (For more information, see the exhibit on the Cintra/Tektronix 909. The exhibit is now permanently dedicated to the memory of this brilliant man.

7/15/2005
Created a new page to document the on-going project to create the "brick and mortar" (actually, wood & nails) Old Calculator Museum. This is
a work-in-process, and will be updated from time to time as the project continues. The page is called The Old Calculator Physical Museum, and is hosted in the Articles & Other
Information section.

7/14/2005
Updated the
Cintra/Tektronix 909 exhibit with a couple of additional photos of Cintra's initial employees and the company's first headquarters.

7/6/2005
Updated the Links page to include
a link to Takaharu Yoshida's Calculator Site. A nice site with some great machines, including a Busicom 141PF, and an extremely unusual Sharp Compet 16 with Itron display. Great photographs of the machines inside and out. Note that most text is Japanese, but some English is interspersed.

4/23/2005
Major update to the
SCM 240SR exhibit to include a great deal of more inforamation on
the story of Stan Frankel's calculator design, a connection with
Electrosolids Corp and the formation of Computron Corporation, and how
SCM ended up acquiring Computron and selling the calculator that had
been developed. Sincere thanks to Joseph Strick (President of Electrosolids)
for providing all of this information.
Updated the Links page to include
a link to Mark
Glusker's "Mechanical Calculating" site..

1/19/2005
Added page to the Wanted
section for the Ricoh Ricomac 1200. Thanks
to Martin Willemsen for kindly providing the photo of his machine.
Some updates to the Commodore C112
exhibit, including addition of Spec Sheet.

10/18/2004
Updated the
SCM 240SR exhibit to include more information on the magnetostrictive
delay line used in the machine.

10/15/2004
Updated the
SCM 240SR exhibit to remove information crediting Stanley Frankel
with the development of the MINIAC computer. This information turned
out to be incorrect. Sincere thanks to Mr. Steve Leibson for
his in-depth research on Mr. Frankel which clarified many aspects of
Frankel's work.

9/10/2004
Updated the
Victor 1800-1441 exhibit to include more detail regarding display
driver circuitry. Thanks to Godfrey Leggett for information about the
hybrid driver modules.
Various updates to the Thanks &
Acknowledgements page.

5/27/2004
Updates to the Compucorp 140 exhibit to include information about the function of the "LEFT" and "RIGHT" keys. Thanks to Mr. Anders Classon for explaining the function of these previously
mysterious keys.

5/8/2004
Added the
Facit 1125
calculator to the Wanted page.
Thanks to Rainer Fredrich for providing the nice photo of this machine.

2/16/2004
Updated the
Cintra/Tektronix 909 exhibit with additional information.
Added additional photo of the
Burroughs C7400 calculator to the
Wanted page. Thanks to Richard Brain for providing a nice photo
of his machine.Museum News:For the next 12 to 14 months, the Old Calculator Web
Museum will see limited updates due the curator moving into temporary
quarters while awaiting the construction of a new home. All of the museum's
machines are in storage during this time. Once the new home
is completed, the museum will be moved into a 1800 sq. ft. heated/air conditioned
shop building which is currently serving as storage for all of our household
items (furniture, and many, many boxes of stuff) which will serve as a
physical museum, as well as the workshop for performing calculator restoration
and maintenance. For a period of time between February 5, 2004, and February
13, 2004, EMail directed to the museum bounced during the time the our
server was offline for the move. If you sent EMail to the museum during
this time, please resend your message.

9/10/2003
Updated the SCM/Marchant
Cogito 240SR exhibit to include information about Thomas Osborne's early
and short-lived involvement in the 240SR project at SCM.

9/4/2003
Updated the
Sharp Compet 22 exhibit to include a photo and additional information
about the Sharp CSA-12
Memorizer-60 accessory that could be connected to the Compet 22 to allow simple
learn-mode programming capabilities. Sincere thanks to Dick Rubenstein for
providing the photo of this device to the museum.

8/29/2003
Updated the
Sharp Compet 22 exhibit with additional information on the "Memorizer"
accessory that could be added to the Compet 22 to allow simple
learn-mode programming capabilities.

8/21/2003
Updated the
Cintra/Tektronix 909 exhibit with additional information. Re-did
Spec. Sheet for the machine in new format. Many thanks to Robert Krten for
providing a copy of the original Tek 909 reference manual.

7/10/2003
Updated the
Wang 700-Series Board Inventory to include schematics for a number
of the boards. Sincere thanks to Jim Battle for going to all the work
to find and scan these documents for the museum.

6/3/2003
Updated the Friden 130 exhibit
to add photo of Friden 130 Playing Cards, an early marketing giveaway
to publicize the machine.
Profound thanks to Dick Ahrens for donating this wonderful artifact to
the museum.

4/29/2003
Added "Coming Soon" exhibit: Friden EC-132.

4/6/2003
Updated the
Brother Calther 412 exhibit to include additional photos, and improved
versions of earlier photos. Also some updates to the text of the exhibit.

3/27/2003
Added
Hitachi KK471
to the Wanted section.
Many thanks to Mr. Steven Smith for providing the photo
of this machine.

3/20/2003
Updated the
Brother ProCal 514
page in the Wanted section to include a
photo. Many thanks to Mr. Charles Littell, III for providing the photo
of this interesting calculator.

3/20/2003
The Old Calculator Web Museum now has it's own domain,
"oldcalculatormuseum.com". Visitors can now use
http://oldcalculatormuseum.com
instead of the previous "http://www.geocities.com/oldcalculators"
as a means to access the site. The previous URL will continue to work
indefinitely, so there is no need to change bookmarks.

3/4/2003
Updated the
Addo-X 9958
page in the Wanted section to include a
photo and some additional information. Many thanks to Mr. Andreas Zinn
for providing the photo of this great machine.
Updated the exhibit on the Burroughs
C-3350 exhibit to include a photo of the Addo-X 9958, which is
a very similar calculator marketed by Swedish company Addo-X as an OEM
customer of Sharp Corporation.

1/29/2003
Major re-work of the
History of Compucorp essay in the
Articles & Other Information
section, adding significant new information and photos
provided by principals involved in Computer Design Corporation. Profound
thanks to Mr. Carlos Tomaszewski and Mr. Norman Grannis for sharing their
memories.
Added "Videos" section to the
Articles & Other Information
section, providing an index to the various video clips of calculators in
operation.

12/29/2002
Updated the Commodore AL-1000
exhibit to add information about the AL-1000S, a follow-on machine with
built-in I/O interface for an external I/O typewriter.
Updated the Sony ICC-500W exhibit to include
additional information on published performance specifications, as well as
information about external power options available for the first generation
Sony calculators.
Updated the Sony ICC-1500W exhibit to include
additional information on published performance specifications.

10/2/2002
Updated the Wang 370
page in the Wanted section to include an additional
photo, and to conform with the new Wanted page formatting.
Updated the Wang 380 page in
the Wanted section to include
an additional photo.

9/29/2002
Added the Logicon "Computer" to the
Wanted Page. Special thanks
to Dr. Norman Martin, the inventor of this purpose-built programmable
calculator to assist engineering computations at Logicon, Inc., for the
use of this photo, and providing information about this wonderful machine.
With the help of Dr. Martin, I am putting together an essay about this
machine. While it was never marketed as a commercial product, this machine
still holds a place in the history of desktop electronic calculating machines.

9/25/2002
Added a new story to the "Recollections & Reflections"
section of the Articles & Other Information
page, about the life and times of a long-time Friden employee, Mr. Dick
Ahrens. Ahrens was involved in the early days of electronic calculators at
Friden. His story outlines
the early days of Mr. Ahrens' employment at Friden, and highlights
some of his memories of the development, and the people behind the development,
of Friden's first electronic calculators. Heartfelt thanks to Dick for
sharing this wonderful story!

9/24/2002
Added "Coming Soon" exhibit: Sony ICC-400W.

9/22/2002
Added new "Tech Notes"
page documenting Wang Laboratories internal Integrated Circuit part
numbers.
Links to this page can be found in the Spec Sheets for the
Wang 720C and
Wang 600 calculator exhibits,
as well as in the index of Tech Notes in the Calculator Technology section of the
Articles and Other Information
page of the museum.Profound thanks to Mr. Dennis McNurland for donating the
document that provided the source for this information.

8/25/2002
Added a wonderful new story in the "Recollections & Reflections"
section of the
Articles & Other Information
page. This story outlines
the early days of Dennis McNurland's employment at Wang Laboratories as a
product service technician. Sincere thanks to Dennis for sharing his
great story!

8/11/2002
Updated the Friden 1152 exhibit
to include information about varying color front panels.
Updated the Sharp Compet 22 exhibit to add
information about Facit's OEM version of the Compet 22, the Facit 1124.
Numerous additions to the Wanted page.